Wood Biochar (image) University of Illinois at Urbana-Champaign Caption Any kind of wood can be made into biochar by heating in a low-oxygen chamber. Some types of wood work better than others. Pictured (left to right) are white birch, white pine and red cedar. Credit L. Brian Stauffer Usage Restrictions Credit: L. Brian Stauffer Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.